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just one minor detail about your sample queries -- in a LEFT OUTER JOIN, if you have a WHERE condition on a column of the right table, this effectively changes the LEFT OUTER JOIN into an INNER join because it can no longer return unmatched rows from the left table

your last example should say:

Code:

select *
from Mem
left outer
join Run
on Run.fk_MID = Mem.MID
and Run.PAID <> 2
where Mem.MID <> 366